[PATCH linux-next v6 08/13] mfd: intel-peci-client: Add PECI client MFD driver
Jae Hyun Yoo
jae.hyun.yoo at linux.intel.com
Fri Jun 22 05:41:10 AEST 2018
This commit adds PECI client MFD driver.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>
Cc: Andrew Jeffery <andrew at aj.id.au>
Cc: James Feist <james.feist at linux.intel.com>
Cc: Jason M Biils <jason.m.bills at linux.intel.com>
Cc: Joel Stanley <joel at jms.id.au>
Cc: Vernon Mauery <vernon.mauery at linux.intel.com>
---
drivers/mfd/Kconfig | 14 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/intel-peci-client.c | 182 ++++++++++++++++++++++++++
include/linux/mfd/intel-peci-client.h | 81 ++++++++++++
4 files changed, 278 insertions(+)
create mode 100644 drivers/mfd/intel-peci-client.c
create mode 100644 include/linux/mfd/intel-peci-client.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b860eb5aa194..de4b221bc14f 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -565,6 +565,20 @@ config MFD_INTEL_MSIC
Passage) chip. This chip embeds audio, battery, GPIO, etc.
devices used in Intel Medfield platforms.
+config MFD_INTEL_PECI_CLIENT
+ bool "Intel PECI client"
+ depends on (PECI || COMPILE_TEST)
+ select MFD_CORE
+ help
+ If you say yes to this option, support will be included for the
+ multi-funtional Intel PECI (Platform Environment Control Interface)
+ client. PECI is a one-wire bus interface that provides a communication
+ channel from PECI clients in Intel processors and chipset components
+ to external monitoring or control devices.
+
+ Additional drivers must be enabled in order to use the functionality
+ of the device.
+
config MFD_IPAQ_MICRO
bool "Atmel Micro ASIC (iPAQ h3100/h3600/h3700) Support"
depends on SA1100_H3100 || SA1100_H3600
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index e9fd20dba18d..3b1604da7931 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -191,6 +191,7 @@ obj-$(CONFIG_MFD_INTEL_LPSS) += intel-lpss.o
obj-$(CONFIG_MFD_INTEL_LPSS_PCI) += intel-lpss-pci.o
obj-$(CONFIG_MFD_INTEL_LPSS_ACPI) += intel-lpss-acpi.o
obj-$(CONFIG_MFD_INTEL_MSIC) += intel_msic.o
+obj-$(CONFIG_MFD_INTEL_PECI_CLIENT) += intel-peci-client.o
obj-$(CONFIG_MFD_PALMAS) += palmas.o
obj-$(CONFIG_MFD_VIPERBOARD) += viperboard.o
obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o
diff --git a/drivers/mfd/intel-peci-client.c b/drivers/mfd/intel-peci-client.c
new file mode 100644
index 000000000000..d7702cf1ea50
--- /dev/null
+++ b/drivers/mfd/intel-peci-client.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018 Intel Corporation
+
+#include <linux/bitfield.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/intel-peci-client.h>
+#include <linux/module.h>
+#include <linux/peci.h>
+#include <linux/of_device.h>
+
+enum cpu_gens {
+ CPU_GEN_HSX = 0, /* Haswell Xeon */
+ CPU_GEN_BRX, /* Broadwell Xeon */
+ CPU_GEN_SKX, /* Skylake Xeon */
+};
+
+static struct mfd_cell peci_functions[] = {
+ {
+ .name = "peci-cputemp",
+ .of_compatible = "intel,peci-cputemp",
+ },
+ {
+ .name = "peci-dimmtemp",
+ .of_compatible = "intel,peci-dimmtemp",
+ },
+};
+
+static const struct cpu_gen_info cpu_gen_info_table[] = {
+ [CPU_GEN_HSX] = {
+ .family = 6, /* Family code */
+ .model = INTEL_FAM6_HASWELL_X,
+ .core_max = CORE_MAX_ON_HSX,
+ .chan_rank_max = CHAN_RANK_MAX_ON_HSX,
+ .dimm_idx_max = DIMM_IDX_MAX_ON_HSX },
+ [CPU_GEN_BRX] = {
+ .family = 6, /* Family code */
+ .model = INTEL_FAM6_BROADWELL_X,
+ .core_max = CORE_MAX_ON_BDX,
+ .chan_rank_max = CHAN_RANK_MAX_ON_BDX,
+ .dimm_idx_max = DIMM_IDX_MAX_ON_BDX },
+ [CPU_GEN_SKX] = {
+ .family = 6, /* Family code */
+ .model = INTEL_FAM6_SKYLAKE_X,
+ .core_max = CORE_MAX_ON_SKX,
+ .chan_rank_max = CHAN_RANK_MAX_ON_SKX,
+ .dimm_idx_max = DIMM_IDX_MAX_ON_SKX },
+};
+
+static int peci_client_get_cpu_gen_info(struct peci_mfd *priv)
+{
+ u32 cpu_id;
+ int i, rc;
+
+ rc = peci_get_cpu_id(priv->adapter, priv->addr, &cpu_id);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < ARRAY_SIZE(cpu_gen_info_table); i++) {
+ if (FIELD_GET(CPU_ID_FAMILY_MASK, cpu_id) +
+ FIELD_GET(CPU_ID_EXT_FAMILY_MASK, cpu_id) ==
+ cpu_gen_info_table[i].family &&
+ FIELD_GET(CPU_ID_MODEL_MASK, cpu_id) ==
+ FIELD_GET(LOWER_NIBBLE_MASK,
+ cpu_gen_info_table[i].model) &&
+ FIELD_GET(CPU_ID_EXT_MODEL_MASK, cpu_id) ==
+ FIELD_GET(UPPER_NIBBLE_MASK,
+ cpu_gen_info_table[i].model)) {
+ break;
+ }
+ }
+
+ if (i >= ARRAY_SIZE(cpu_gen_info_table))
+ return -ENODEV;
+
+ priv->gen_info = &cpu_gen_info_table[i];
+
+ return 0;
+}
+
+bool peci_temp_need_update(struct temp_data *temp)
+{
+ if (temp->valid &&
+ time_before(jiffies, temp->last_updated + UPDATE_INTERVAL))
+ return false;
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(peci_temp_need_update);
+
+void peci_temp_mark_updated(struct temp_data *temp)
+{
+ temp->valid = 1;
+ temp->last_updated = jiffies;
+}
+EXPORT_SYMBOL_GPL(peci_temp_mark_updated);
+
+int peci_client_command(struct peci_mfd *priv, enum peci_cmd cmd, void *vmsg)
+{
+ return peci_command(priv->adapter, cmd, vmsg);
+}
+EXPORT_SYMBOL_GPL(peci_client_command);
+
+int peci_client_rd_pkg_cfg_cmd(struct peci_mfd *priv, u8 mbx_idx,
+ u16 param, u8 *data)
+{
+ struct peci_rd_pkg_cfg_msg msg;
+ int rc;
+
+ msg.addr = priv->addr;
+ msg.index = mbx_idx;
+ msg.param = param;
+ msg.rx_len = 4;
+
+ rc = peci_command(priv->adapter, PECI_CMD_RD_PKG_CFG, &msg);
+ if (!rc)
+ memcpy(data, msg.pkg_config, 4);
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(peci_client_rd_pkg_cfg_cmd);
+
+static int peci_client_probe(struct peci_client *client)
+{
+ struct device *dev = &client->dev;
+ struct peci_mfd *priv;
+ int rc;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->client = client;
+ priv->dev = dev;
+ priv->adapter = client->adapter;
+ priv->addr = client->addr;
+ priv->cpu_no = client->addr - PECI_BASE_ADDR;
+
+ snprintf(priv->name, PECI_NAME_SIZE, "peci_client.cpu%d", priv->cpu_no);
+
+ rc = peci_client_get_cpu_gen_info(priv);
+ if (rc)
+ return rc;
+
+ rc = devm_mfd_add_devices(priv->dev, priv->cpu_no, peci_functions,
+ ARRAY_SIZE(peci_functions), NULL, 0, NULL);
+ if (rc < 0) {
+ dev_err(priv->dev, "devm_mfd_add_devices failed: %d\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id peci_client_of_table[] = {
+ { .compatible = "intel,peci-client" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, peci_client_of_table);
+#endif
+
+static const struct peci_device_id peci_client_ids[] = {
+ { .name = "peci-client", .driver_data = 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(peci, peci_client_ids);
+
+static struct peci_driver peci_client_driver = {
+ .probe = peci_client_probe,
+ .id_table = peci_client_ids,
+ .driver = {
+ .name = "peci-client",
+ .of_match_table =
+ of_match_ptr(peci_client_of_table),
+ },
+};
+module_peci_driver(peci_client_driver);
+
+MODULE_AUTHOR("Jae Hyun Yoo <jae.hyun.yoo at linux.intel.com>");
+MODULE_DESCRIPTION("PECI client MFD driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/intel-peci-client.h b/include/linux/mfd/intel-peci-client.h
new file mode 100644
index 000000000000..7ec272cddceb
--- /dev/null
+++ b/include/linux/mfd/intel-peci-client.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2018 Intel Corporation */
+
+#ifndef __LINUX_MFD_PECI_CLIENT_H
+#define __LINUX_MFD_PECI_CLIENT_H
+
+#include <linux/peci.h>
+
+#if IS_ENABLED(CONFIG_X86)
+#include <asm/intel-family.h>
+#else
+/**
+ * Architectures other than x86 cannot include the header file so define these
+ * at here. These are needed for detecting type of client x86 CPUs behind a PECI
+ * connection.
+ */
+#define INTEL_FAM6_HASWELL_X 0x3F
+#define INTEL_FAM6_BROADWELL_X 0x4F
+#define INTEL_FAM6_SKYLAKE_X 0x55
+#endif
+
+#define LOWER_NIBBLE_MASK GENMASK(3, 0)
+#define UPPER_NIBBLE_MASK GENMASK(7, 4)
+
+#define CPU_ID_MODEL_MASK GENMASK(7, 4)
+#define CPU_ID_FAMILY_MASK GENMASK(11, 8)
+#define CPU_ID_EXT_MODEL_MASK GENMASK(19, 16)
+#define CPU_ID_EXT_FAMILY_MASK GENMASK(27, 20)
+
+#define CORE_MAX_ON_HSX 18 /* Max number of cores on Haswell */
+#define CHAN_RANK_MAX_ON_HSX 8 /* Max number of channel ranks on Haswell */
+#define DIMM_IDX_MAX_ON_HSX 3 /* Max DIMM index per channel on Haswell */
+
+#define CORE_MAX_ON_BDX 24 /* Max number of cores on Broadwell */
+#define CHAN_RANK_MAX_ON_BDX 4 /* Max number of channel ranks on Broadwell */
+#define DIMM_IDX_MAX_ON_BDX 3 /* Max DIMM index per channel on Broadwell */
+
+#define CORE_MAX_ON_SKX 28 /* Max number of cores on Skylake */
+#define CHAN_RANK_MAX_ON_SKX 6 /* Max number of channel ranks on Skylake */
+#define DIMM_IDX_MAX_ON_SKX 2 /* Max DIMM index per channel on Skylake */
+
+#define CORE_NUMS_MAX CORE_MAX_ON_SKX
+#define CHAN_RANK_MAX CHAN_RANK_MAX_ON_HSX
+#define DIMM_IDX_MAX DIMM_IDX_MAX_ON_HSX
+#define DIMM_NUMS_MAX (CHAN_RANK_MAX * DIMM_IDX_MAX)
+
+#define TEMP_TYPE_PECI 6 /* Sensor type 6: Intel PECI */
+
+#define UPDATE_INTERVAL HZ
+
+struct temp_data {
+ uint valid;
+ s32 value;
+ ulong last_updated;
+};
+
+struct cpu_gen_info {
+ u16 family;
+ u8 model;
+ uint core_max;
+ uint chan_rank_max;
+ uint dimm_idx_max;
+};
+
+struct peci_mfd {
+ struct peci_client *client;
+ struct device *dev;
+ struct peci_adapter *adapter;
+ char name[PECI_NAME_SIZE];
+ u8 addr;
+ uint cpu_no;
+ const struct cpu_gen_info *gen_info;
+};
+
+bool peci_temp_need_update(struct temp_data *temp);
+void peci_temp_mark_updated(struct temp_data *temp);
+int peci_client_command(struct peci_mfd *mfd, enum peci_cmd cmd, void *vmsg);
+int peci_client_rd_pkg_cfg_cmd(struct peci_mfd *mfd, u8 mbx_idx,
+ u16 param, u8 *data);
+
+#endif /* __LINUX_MFD_PECI_CLIENT_H */
--
2.17.1
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